Who is at fault? Mother or son?

like father like son, this is what fits properly. son and father are at fault. mother gave everything possible but the son seems to be ungrateful towards mother, such kids should not be helped anymore. let make something of himself. she needs to grow stronger if wants set it right. ur second question: yes parents are not only the family but world for there children. third question: duty of bringing up was completed by mother and not by father, but that doesn't give the license to son not to perform his duties. as the loan would be in mother's name nothing can be done for it but for road ahead she should be strict and not help him in unwanted needs only help in the wants, let the bank take the bike away, and let him travel then only he will understand.