One major issue facing children of many ba’alei t’shuva is lack of extended family who are part of their community. All their friends seem to have cousins being raised the same way they are, and these children do not. Their grandparents are not the same as those of their friends, and they do not have relatives’ simchos or family gatherings (of the same nature as their friends’) to attend. This can be very isolating for children, even if there are many siblings in the family, as extended family plays a crucial role in the frum community.
I’m the child of a BT and a semi FFB and it is hard not having any family around. (That could also be due to the fact that we live in a different country then them all :)) But you can make your own “family”. My family is very close with a bunch of people that I consider siblings, aunts, even a few mothers ;)… that none of my friends whose parents are FFB’s can understand.