My son is 12 and his hands are wide apart when he grips the bat. He’s a left hander and it looks awkward and I want to help but don’t have any real idea.
Is there some advice I can get to help him?

It’s important to let your son continue to have fun, score runs and let his game develop.
If you are worried about this grip here’s a little exercise that’s guided many batters over the years
Place the bat face down on the ground with the back of the back facing upwards. Ask your son to pick the bat up with the palm of hands face down and the ‘v’ between the thumb and index finger on both hands facing down the spine of the bat.
If it feels natural with his hands close together that’s a good sign. If at his age he’d prefer to have a little gap between his bottom and top hand that’s ok as well as he can develop as he gets older and stronger.
I come across this piece of advice Don Bradman offered Greg Chappell early in his career.

“He showed me his grip with the ‘V’ of the thumb and forefinger down the splice of the bat, slightly to the off side of neutral. He said, ‘This will feel a bit strange because you haven’t done it before, but I recommend that you persevere because it will improve your off-side play’.

Hi Chris,
If you download the CA Coach App and go to Insiders Tips (Batting) you will find a few videos on the various batting grips. While the advice from Dean is perfect, different elite players do grip the bat differently and it is eventually worth understanding the strengths and weakness of the various grips the better players use.
Lots of other good stuff in the App as well. Enjoy