Why does my husband and father always tell me that his family is poor and he needs to spend less money?

Old people all come from hard times, and it is their duty and responsibility to warn the next generation to be thrifty and housekeeping. According to what you said, there should be no other meaning. Just a reminder. Husband and wife need to run in, and both have a running-in period. Being with the elderly also needs running-in. Never mind what they say. Don't think too much as long as you don't directly point out where the money is spent.