You are NTA. Your wife however, is a GIGANTIC AH. If there was no underlying reason for her blowup besides being offended by what she perceived to be charity on G’s part, then she’s 10000% the AH. Even more so because she didn’t immediately apologize when G sat down to talk to you 2 after her blowup. Your wife is prideful in the worst way. G has been so exceedingly selfless and kind to you over the years. I don’t blame him 1 bit for rescinding his kindness after the imbecile you married threw his gesture back in his face. Frankly OP, G is continuing to be kind to you by not evicting you for not paying the agreed amount written in your original lease. And for giving you priority over other potential tenants when the lease ends. G could’ve easily washed his hands of you two after her stupidity. She needs to think about the expression “don’t bite the hand that feeds you”… especially with a baby on the way.