OP, have you talked to any of your other neighbors to see if this is universal, or just your family that's getting ignored? Is there a local Haitian community leader that you can speak to?
I live in a sort of rural subdivision; about a quarter of my neighbors are from another, extremely conservative, culture and the more conservative do their best not to mix with neighbors not of their faith. Won't smile at "us", won't answer if addressed, etc. Clothing choice is the only outward indication whether you are or aren't of this group.
I'm an anomaly -- I know the basics of the language, and greeted a couple of neighbors in it while we were all at the mailboxes. After a few days of this, I started getting greeted back, very tentatively,
rarely with eye contact. But greeted. Then I blew it... walked down to the mailbox one day with our black lab and it was like I'd offered to commit mass murder. Found out that in this particular faith, one of the disguises of the devil is as a black dog, and here I was bringing one to meet them.
Thanks to a more open neighbor, I understand what the issue is, and at least some of the more conservative ones who'd say "good morning" before are slowly going back to that, but it's been years.
It was all very puzzling until I found out what I'd done to trigger this.