One who travels to a customary area: Are the rulings of travel obligatory upon him?

A man resides in the Eastern Region and has a house here where he comes with his family in the summer for a month or two. Sometimes he comes alone for a few days. Do they have the dispensation of travel regarding combining prayers and shortening the prayer? And if the mosque is far from his house and there is a prayer place nearby, is he obligated to pray in it?
If this man considers his place in the Eastern Region and his place here both to be his home, then he does not shorten the prayer, and it is not obligatory for himMeaning: to take the dispensation of travel, neither by combining nor by shortening, nor by wiping over the leather socks for three days;Because he has two residences: having a residence there and a residence here. However, if he considers his home and base to be the Eastern Region and comes here for a visit or for recreation for a short period, then he is a traveler. But it is obligatory for him, if he hears the call to prayer, to respond, and he has no excuse for leaving the congregational prayer. If he responds, he will complete the prayer following their imam. If he misses it, he has the option to shorten the prayer.