It sounds to me like Mormons practice legalism. That’s contrary to scripture (one of many ways they fall afoul of the Bible). Also, where does it say giving money to take care of family doesn’t count as using it for God’s purposes?
I keep writing on this thread, because some Christians seem intent to write “Rules and Regulations for Proper Giving.” Paul challenged Peter over this line of thought. We are not subject to circumcision, 10% tithes, food limits, etc.
As in that famous movie about the 10 Suggestions? It says "commandments" in my copy. Check Malachi 3:8-10.
That's putting it mildly. I'd say, Paul got in Peter's face.
Practice;
Preach;
Teach;
and chisel in stone!