Is getting agitated when someone walks in on you praying something to be concerned about? In general, I strongly dislike when my family members see me do worship.
It is normal to dislike being looked at when you feel others might be judging you regardless of the activity you are performing. Even if you love your family and they love you, if for example they are non-Muslim or non-practicing Muslims and find the prayer funny, you will not like to do it in their presence, similar to the way you wouldn’t want to work on a painting in the presence of someone who thinks painting is a foolish activity.
And God knows best.
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