I can’t come to terms with my husband sending money

My husband sends money monthly to his family (parents and siblings) who live overseas in a third world country. No one works because of the government there. He sends about $600-$800 a month. He works full time but it’s not stable, so when he’s not doing his full time job, he does Uber at night. I’m a SAHM and we have a newborn and a toddler. We also have a mortgage, paying our tax instalments, and of course utilities, groceries, etc. Every month when he tells me he’s off to send them money it just angers me because we are already tight. He’s a wonderful husband and does everything for us but I can’t seem to come to terms with him sending money. Is it a jealousy thing? Probably, I’ll admit. Is anyone else in a similar situation? I just wish I wouldn’t feel this way and just accept it. I hate this jealousy I have.

UPDATE: my husband has brought up a couple times this week that he intends to send money to them this month. I’m thinking to say that I’m comfortable with $500 a month, anything over that amount is simply unfair for us. I don’t feel good saying this to him, but I think it’s the most reasonable thing to do.