My brother owns the old family homestead.
This is hard to answer without more information about him.
Are you two close?
We're not as close as we used to be.
Did you decide whether to mail it or not?
Oh... I thought your parents were behind you on this.
If not, then at the least, I'd wait a few days to think it over some more.
Since both your mother and your brother object to your "tending to their business," you are volunteering for a thankless, no-win role as the relationship-fixer.
Welcome to the board! That was good advice you gave.