Should not be a limit.
The number of siblings a horse can have varies. For instance a mare typically only has one foal at a time, but they can have twins which is rare and also triplets which is even more rare. A foal can have full siblings that are older or younger if the same parents were mated again, or half siblings if the mother was mated to another stallion. Something more twenty would be the limit for the number of full siblings.
In-school deferments have no limit on the length of use, nor do they have a limit on how many times one can use an in-school deferment. Your servicer may not get this information so make sure you call them to check your repayment status as they may have to send you a form.
George Whitefield was one of seven siblings.
Siva is one of eight siblings.. he has one twin called Kumar.
Siva is one of eight siblings.. he has one twin called Kumar.
one
one
One
one kid
One sister.
one
he has one brother and one sister