Many complain about how Thais use farangs (AKA ATM cards,) but here's a perfect example that they will use other family members too. To me as an American from working families, I don't see this happen "as much" in our culture. Sure, some parents allow children to stay at home way past their sell-by date, but the rest of us don't approve of an adult still using his parents. We certainly wouldn't approve of irresponsible parents using children.
In Thailand it seems that many think that what belongs to one member of the family belongs to the whole family, and I have seen several farangs have to use various methods to set them straight about farang money.
I'm scared to death to marry a Thai and think I never will. I'm used to a culture where I'd marry the whole family in that we'd send birthday cards and get together for Christmas if possible. I could never get used to the idea that I or my wife was responsible for a whole family.
It happens.
I hereby invite everyone to join my new religion, haha. It costs nothing, involves no paperwork, and has just one rule. You may not pay sin sod, haha. (smiles.)