Is it true step-sibling is translated the same as sibling-in-law?


I often see these weird translations sometimes of sibling-in-law (or sister-
in-law or brother-in-law) but what they really mean is step-sibling (or step-
sister or step-brother).

I had the strangest feeling that there's some lost in translation thingy and
then I found [this](https://teamjapanese.com/sister-in-japanese/) (which is
for sisters) :

> Finally, _giri_ no can also mean ‘step’ as in ‘stepsister’. The Japanese
> have a conservative stance on divorce, hence, there is no exact word for
> step siblings.

  1. Is it true step-sibling is translated the same as sibling-in-law?

  2. If yes: In practice, how is this dealt with? I imagine

> 'My "sibling-in-law" is coming over.' / 'Sibling of your spouse? Or spouse
> of your sibling?' / 'I actually mean my parent's 2nd spouse's child...'

or just skipping straight

  3. If yes: Maybe not quite on-topic, but well, step-siblings may arise from being widows or adoptive parents, so I don't really see this as a divorce thing necessarily, so I think there would be a need to distinguish the 2 concepts. What's up with that?

  4. If no: then ok what's going on with the above quote please?

Possibly related, maybe even a duplicate: [Is the kanji for sister-in-law and
step sister the same?](https://japanese.stackexchange.com/questions/84454/is-
the-kanji-for-sister-in-law-and-step-sister-the-same)




The short answer is yes, the same word is used for step siblings and siblings-
in-law. After all, step siblings are just siblings in legal terms, so I don't
think it is particularly odd.

For simplicity, just consider a younger sister(-ish) who is not biologically
related to you and a situation where you introduce her to someone outside
family.

  * If she is your spouse's sister, she is introduced most probably as 義妹{ぎまい} or 義理{ぎり}の妹{いもうと} (or simply 妻{つま}/夫{おっと}の妹).
  * If she is a step-sister of yours (i.e., a child from your parent's previous marriage or a sibling by adoption), then you are likely to introduce her just as 妹. Later you may 'reveal' that she is not sister by blood, in which case you say she is a 義理の妹.

That is, 義理の妹/義妹 can be used for step-sister and sister-in-law, but step
sister is less frequently mentioned as such. Rather, in ordinary
conversations, there is no explicit distinction between blood-related siblings
and step-siblings. This may depend on each person, of course.

* * *

Half-siblings are called
[異母妹{いぼまい}](https://kotobank.jp/word/%E7%95%B0%E6%AF%8D%E5%A6%B9-2008429)
(same father) or
[異父妹{いふまい}](https://kotobank.jp/word/%E7%95%B0%E7%88%B6%E5%A6%B9-2008393)
(same mother). Mutatis mutandis for other types. In speech, the former is more
commonly called はらちがいの妹 and the latter is just 父親が違う (there is a word たねちがい,
but I think it is not so commonly used). And these won't be mentioned most of
the time.

Overall, I guess these things are similar elsewhere, you don't necessarily
disclose relationships so that it sounds she is a family member.

* * *

For mother, there are specific terms although there're still some ambiguities.

  * 義母{ぎぼ} spouse's mother
  * 養母{ようぼ} adoptive mother
  * 継母{ままはは} step-mother (someone who became your mother by marrying your father)




The short answer is yes, the same word is used for step siblings and siblings-
in-law. After all, step siblings are just siblings in legal terms, so I don't
think it is particularly odd.

For simplicity, just consider a younger sister(-ish) who is not biologically
related to you and a situation where you introduce her to someone outside
family.

  * If she is your spouse's sister, she is introduced most probably as 義妹{ぎまい} or 義理{ぎり}の妹{いもうと} (or simply 妻{つま}/夫{おっと}の妹).
  * If she is a step-sister of yours (i.e., a child from your parent's previous marriage or a sibling by adoption), then you are likely to introduce her just as 妹. Later you may 'reveal' that she is not sister by blood, in which case you say she is a 義理の妹.

That is, 義理の妹/義妹 can be used for step-sister and sister-in-law, but step
sister is less frequently mentioned as such. Rather, in ordinary
conversations, there is no explicit distinction between blood-related siblings
and step-siblings. This may depend on each person, of course.

* * *

Half-siblings are called
[異母妹{いぼまい}](https://kotobank.jp/word/%E7%95%B0%E6%AF%8D%E5%A6%B9-2008429)
(same father) or
[異父妹{いふまい}](https://kotobank.jp/word/%E7%95%B0%E7%88%B6%E5%A6%B9-2008393)
(same mother). Mutatis mutandis for other types. In speech, the former is more
commonly called はらちがいの妹 and the latter is just 父親が違う (there is a word たねちがい,
but I think it is not so commonly used). And these won't be mentioned most of
the time.

Overall, I guess these things are similar elsewhere, you don't necessarily
disclose relationships so that it sounds she is a family member.

* * *

For mother, there are specific terms although there're still some ambiguities.

  * 義母{ぎぼ} spouse's mother
  * 養母{ようぼ} adoptive mother
  * 継母{ままはは} step-mother (someone who became your mother by marrying your father)

