Suspected autism iin grandson from border walking. do i or his mother make an appointment?

Mother must be there: Autism, per se, is not typically associated with delays in walking. But, delays of any sort merit attention. Perhaps you could start by offering to go with mother and child for a visit to the pediatrician to discuss developmental milestones and other concerns you have. But the mother is the guardian & will have to be responsible for the child if there are problems, hopefully with your support.

His mother should.: If there are concerns regarding any developmental issue, the first stop is at his pediatrician's for a full exam and history (including development). If the pediatrician agrees, the next step is with either a pediatric neurologist or developmental-behavioral specialist for further evaluation and management.