So, how would the family court decide this/what is the most likely outcome -
Dad is trying to take full custody (resident parent or however it's said now) of DS who is almost 3.
Mum is completely fighting against that and fighting for dad to have DS to stay twice a week only.
The reason dad has took mum to court for custody is because mum has moved on, got a new DP and ended up pregnant very soon, his argument is that she's clearly irresponsible for that, isn't prioritizing DS and he'll subsequently get pushed out and needs more stability than that.
DS has always lived with mum. For the first year, dad was only involved through supervised contact (through mums choice).
He doesn't pay maintenance anymore.
He doesn't have his own home and lives with parents (and a brother who has been convicted of drug charges) although dad plans to move out and get a house of his own.
He had one minor drug charge himself as a teen.
Claims that he has seen mum first-hand treat DS unfairly with excessive discipline (shouting/screaming) etc.
Comes across all well-spoken and just completely a degree.
Mum works, has ran a home by herself (at 18 with DS), and admits to accidentally getting pregnant soon after the relationship properly broke down but is happy about it and is confident about her good parenting and security in the home for DS.
How would this go? What other factors would they need to consider?