Dogs need routine when potty training. He should be walked in the morning for his business, in the afternoon, after work and just before your bedtime (mom's bedtime). The time is the most important as this will regulate him. Once he does his business, you praise him. Also, in the home (until this is under control), he should have boundries. If he is marking mostly in the living room then he should not be allowed in there at all.
Crating is good however, your mom may get over zealous with this and just leave him there all the time. I believe there are threads about this. Look them up.
He just needs routine and boundries. Once this is understood by him, everything else will fall into place.
Others here will give you more advice on everything. Good luck and keep mom always encouraged.