The MOG is recently widowed (two months ago) and will be attending the wedding solo. She has no brothers. FI is the only son. Her husband's side of the family is not invited to the wedding as no one has seen/spoken to them in years. So, who escorts the MOG down the aisle in the church and at the reception? His only surviving grandparent is his maternal grandmother, however we don't know if she'll attend - she's 89 and would have to travel 1,000 mi to get here. The MOG has 4 sisters and is very close to one of them. Can she escort her down the aisle? Or should her SIL (in BP) or nephew escort her?