Quote Quoting gaviota
How many times do i need to get fingerprinted and interviewed?
I've done this last year in Long Ilsand City,NY ( i have all paper work showing i did this already)
They should only need one biometrics appointment; but if you are unwilling or unable to get them to confirm the prior session it is better to get fingerprinted more than once than to risk having your application for immigration deemed abandoned.

Quote Quoting gaviota
Should i bother going into this interview since I'm now separated (for 5 months)? And if so, will i get into problems? We are still married and have a 4 yr old son together. We dont know if we will get back together ...
If you wish to immigrate, you should of course attend your appointments.

Quote Quoting gaviota
And if not, what are my next options to stay here legally with my child? can they deport me with my US born son if i withdraw my application?
If you abandon your immigration status, and have no other legal basis to be in the country but choose to remain illegally, you would be subject to deportation. I am not sure why you would do that, though.

You would benefit from discussing your situation with an immigration lawyer in advance of your scheduled interview.