Lien on personal property after closing - is it legal

My brother was a subcontractor of his own business until he had to quit due to health reasons. As an end result, they ended up loosing their home on the lake and filed bankruptcy on the other bills. He was listed as sole owner - he and his wife then purchased a home elsewhere and my parents cosigned. As my brother tried to work out a payment plan with one of his creditors they didn't reach agreement. Money was then paid to add this entity to the bankruptcy. At the time they closed on the new home there was "clear title" can they file a lien after the fact? Also my brother died in December. Shouldn't this lawsuit go away?