hi there!
i think you need to confront your family nicely about it, if not, how do your parents feel about your family not acknowledging your pregnancy.. perhaps they could help you decide what to do.

my situation is a little different to yours, but i am still a young mum-in-waiting!
my cousin who is 32 and married for a few years announced her pregnancy back in early september last year, we were all over the moon for her! in mid september i found out i was pregnant (a very welcomed surprise!) and it turns out she was due 3 days before me!
everyone was happy for me, just a little shocked i think and compared me to my cousin whos married and were 'trying' for a baby, while my partner and i were just young and in love (which is true but we thinkits the best thing thats ever happend!)
as time went on i think they learnt to accept my pregnancy was just as special as hers, and her and i have been going thru these last few weeks of waiting on the phone to each other exchanging notes! even thought there is an 11 year age difference... we can relate to each other really well!

good luck with everything!
Rach