You can kindly advise them about their mistakes and it is permissible to pray behind them,unless their mistakes are changing the meaning especially in Alfatiha.

We r in joint family in India..our parents don’t have good knowledge of tajweed…is it ok if they lead prayer and we offer our salah behind them? I am asking this because behind them we notice mistakes in their recitation, I am in doubt whether our salah will be accepted or not.

Prayer | July 26, 2014 10:07 am
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Is it true that whoever recites 100 versrs in tahajjud will be written among those who fear Allah.
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Just 10minutes before adhaan fajr i did tahajud.when adhaan fajr is “on”,i just shockly remember that i did tahajud without wudhu(totally forgot).is my tahajud valid in Allah’s side? I did taraweeh and witr already right away after salah ishaa