Is there any trick to make sweet potatoes as regular potatoes?
White potatoes and sweet potatoes are very different varieties of tuber, you can't get rid of the sweetness and distinctive flavor of the sweet potato. If there's something in particular your family doesn't like then you can work on that, you can also try the LoB (Lots of Butter) technique, or you can try using them in a dish like sweet potato pie or a curry. At the end of the day if they just don't like sweet potatoes then it may be better to just make something they do like.