Regarding HSA account

In 2024, my wife got medical insurance from her employer for entire family and she got a HSA account  also from employer. She and her employer contributed the max amount of $8300.  
Now we decided to do separate tax filing.
1. Is that ok do separate tax filing?
2. We have two kids of 13 & 18 ages, and I am planning to take advantage of child care tax benefits in my tax. Is that ok?
3. My wife received 1099 SA and In wife's tax filing, how do we need to enter the HSA amounts? is it $8300 or $4150?