Mom had 'subclinical' rd 6 months after cataract surgery. No one else in my fam had it. Has lattice in other eye. Is this a family history of rd for me?

Yes. You should have regular eye examination including retinal exams.
Yes. Sounds if you have lattice degeneration which is a risk factor for retinal detachment! lattice is a thinning of the peripheral retina which weakens the retina and sometimes holes develop. When fluid from inside the eye goes into the hole it can cause retinal detachment.