The verb [手伝]{てつだ}う, does it use the particle に?


For example, if I want to say "I helped my uncle yesterday", how would I say
it?

> 昨日私のおじさん **に** てつだいました。

Or, I would just use the particle を.

> 昨日私のおじさん **を** てつだいました。




'昨日私のおじさんをてつだいました' is the correct one.

  * Xをてつだいました when X is the object of 'help'
  * 'にてつだいました' is possible as a sequence in other cases. See <https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q10135898565>

Also as a side note, '昨日おじさんをてつだいました' would be more usual (without '私の') if
the helper is 'I'.

