This is wrong of him! If he is in the standing position, he must stand in line with the others.

One of my uncles keeps chair behind him so he will able to sit and do bow and prostration. As he is able to stand, he stands and prays (where he needs to stand) but he always quite ahead (more then feet) from the row of congregation due to chair. Does it invalid his prayer or make any effects on congregation?

Prayer | November 5, 2015 3:28 am
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if a person deliberately makes a slight error in their posture during salah, such as bending the knees a bit during ruku, would this invalidate their prayer?
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There is a hadith that states if a person is in the masjid and the Adhan goes off, they are not allowed to leave until they pray in Jama’ah. What if a person is not in the masjid but is next door, is it allowed for him to leave?