My absent dad wants to pay for my son's birthday

Sooo to make an extremely long story short, my dad was never there for me. Left my mom the minute he found out she was pregnant and has continued to fail me ever since. We had a major falling out when i got prego (thank you hormones) but he recently has been reaching out. My husband and i are going through tough times financially and can't afford a birthday party for our son this year. We had to cancel last minute last year because my FIL passed away suddenly. So now my husband is upset ghat my dad wants to throw the party for us. What should i do?? I wanna have a party for my baby he really deserves it but i don't want to fight with my hubby either. I'm so torn. Btw his bday is in June so less than a month to decide because of planning....