You should have fulfilled your promise that you made with your wife regarding taking her for Umrah on receiving some definite amount. It is very much possible that Allah has given you the definite amount due to your wife. There is no violation of your parents’ right in case you take your wife there. You should supplicate for your parents when you reach there. It is possible that with your dua your parents also get the chance of performing Umrah.
Allah knows Best!
Darul Uloom Deoband