Maybe you could get TWO snakes? One to keep at your Mom's house and one to keep at your Dad's? You could feed the day you arrive...and then once more the day you leave....which is almost a once-a-week schedule. That way your parents don't have to worry about feeding them if they're at all squeamish or not interested in taking care of a snake. They would need to be willing to provide fresh water while you're away, though, at least every couple of days.