In my husband's family, I can tell that "some" of them "appear" at times by "comments" to be jealous of him. But once again, that is more based on their choices in life,.....having kids early, no jobs, wives don't work, having 4+ kids, not being well educated to get better paying jobs, living off public assistance, etc etc. ..
All those factors play a role, so if we have two incomes, no kids, higher paying jobs, we will "APPEAR" to have a "better " life which is not really true but financial jealously is the root of many family issues.