The older one had a history of abusing his girlfriend/wife? (baby’s mama).
That, coupled with his travel history, may have engendered some FBI interest.
The mother is a kook. What she’s saying may have a kernel of truth in it, but most of it is probably rubbish.
I heard the older one/ grease spot/ was home in Chechnya for 6 months last year. For training, I assume.