Uncaring relatives

Hello, I need help with this situation that has been bothering me for awhile now.

Circumstance or neutral fact: I gave gifts for my cousin’s house warming party and their daughter for another important occasion but they did not do the same for my daughter or my housewarming. They didn’t get us anything so far.
I know it sounds very petty but…

Thought: They don’t care about us; our family is not important to them.

Action: being distant with them or not talking to them as much

Result: not having good relationship with them (We don’t fight; we just talk may be once every 2 weeks or so and nothing more than that).

This is bothering me. Thanks.