Why do people care?

My husband's family irritates me to no end. Everytime how many kids we want comes up everyone tells us we shouldn't have any more kids and it makes me upset because literally me and my husband take very goid care of our kids we have our kids 24/7 365 days a year, we own our home and our car , no one helps us financially as we are set with good finances, we dont get any type of government assistance, and we dont live with any of our parents. Like for real we take care of our own and it frustrates me that they tells us we shouldnt have anymore kids. Just an FYI Yes! We can afford to have more as like i said we are financially well off even with me being a STHM, i also plan on getting a job onces our youngestis old enough for school. And the kicker my husband is the only sibling this well off. The second oldest livescwith his girlfriends parents along with their 4 year old and has a baby on the way yes he has a decent job but hardly has any of the responsibility we have. His twin younger brother have nothing and live at their mothers house the one twins has his girlfriend and daughter that live there too and the other twins girlfriend n daughter have their own place . Like for real we are the only ones that are set up and his family acts like we dont have our shit together . My husband ignores everything so talking to him about it is like hitting a brick wall