This is permissible, and would be counted as voluntary prayer.

My mum has some mild psychiatric condition that makes it difficult for her to focus in her salat. She would sometimes talk to herself or forget the correct sequence. Now she has aged and she has to pray sitting on a chair. I’ve tried leading the prayer and asked her to follow but it didn’t help. After I finish my salat can I repeat salat sitting down to lead her?

Prayer | September 10, 2015 7:06 pm
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What does one do when he sees an imaam and another person side to side together how does one let them know you want to join them? is there any ettiquette of doing a gesture?
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,I wanted to know if the same Imam can lead the jummah twice in the same place if no one else knows how to do the khutbah? May Allah reward you!