Hello and thank you for your question.
Unfortunately, the legal process can be slow.
Provided he follows the process, which presumably his lawyer is assisting him with, the court will ultimately make orders to divide the assets of the marriage (all assets owned by either party) on the basis it considers fair having regard to the contributions of the parties and the need to care for the children, as well as some other considerations which may be relevant, such as whether one of the parties has health issues, etc. Only a fully briefed lawyer, familiar with the detail of the circumstances of the parties can give a firm answer as to what your son's entitlement is likely to be, so your son should be guided by his lawyer in this regard.
The claims by your son's wife for spousal maintenance and claiming the family home are a simply matters that have to be dealt with as part of the property application to the court. No doubt if she has primary care for the children she will be entitled to a signficant share, but how much will depend on the factors listed above.
Child support is a separate issue and is an obligation that a parent in your sons's position has to meet and you can read more about this on the Human Services website:
I trust the above answers your question.
Good luck and please rate my answer.