My 7 year old has changed his password so we can't access his tablet. He hasn't a clue how hes done it but his tablet is linked to my phone. Is there anyway I can reset it from my phone? I'm terrible with technology and I'm also fuming with him!

I've watched a few videos but they all seem to be using the 2016 version which has a button in the centre at the bottom. This tablet is only a few months old as he dropped the 2016 version that we had 😡