There are several reasons behind my choice of location __________ the family visit.

The blank requires a preposition that indicates purpose. 'For' is used to express purpose or intended use—'choice of location for the family visit' means the location chosen with the purpose of hosting the family visit. 'To' would suggest direction. 'In' would suggest containment. 'From' would suggest origin. The preposition 'for' correctly conveys that the location was chosen with the family visit as the purpose.