I have a girlfriend, we both are from same caste same gotra and we have 7 generation gap between us. And after our marriage we don't want any problem in our child .and I have read that having a generation gap of 7 years the child will have no problem. Is their anything we can do. because I know that after 7 generation there should be no problem but I want some information about this. About anything like dna test or anything else which can be enough for satisfy our mind that we will have a healthy baby. And we will be reached about this thing.