I am a member of the church of Christ. I’m a firm believer of giving 10% even if we aren’t commanded. My fiancé gives less since she doesn’t make as much as I do. My question is ‘”Once we get married should we continue giving individual offerings? Another question is “When the Jews gave their 10% under the old law, was it as an individuals or as a family?”
There is no required percentage of giving. See: Are Christians to tithe? When you marry, it is no longer his money and her money. It is the family's income. You decide as a family what is to be given to the Lord in thankfulness for all that He has done for you. "So let each one give as he purposes in his heart, not grudgingly or of necessity; for God loves a cheerful giver" (II Corinthians 9:7).