To managed it a bit easier (when you grow to more than a dozen), it'll be better to have one online login and manage all 'child' accounts.

When a child LLC (disregarded entity) is used to hold each property, and all of the tax reporting is done on the tax return of the parent entity, does each  individual child LLC need to file the BOI Report, or only the parent LLC? 

A child gets exposed to fentanyl in the property, CO poisoning, or someone gets shot in the property and then landlord gets sued.

Other most common factor: Family Size increases due to marriage or having a child. 

I think real estate investors in the game just become confident as to handle new challenges and they call that being experienced - Just like parenting: you think you are experienced with changing diapers, but the child is growing-kindergaten-grade one-baseball/soccer- soon teenage and the jazz goes on - grandparent

Vestin Mortgage was the poster child for this.

.- determine how I can assist child in purchasing his own home in San Diego.  

Society and demographics favor smaller units since marriage and child bearing are being delayed.  

Good luck, you are a busy man with school, family and baseball.Likely your best bet is house hacking (if your partner and child are willing to share housing). 

I'd add a late fee to the lease renewal, but if they are struggling to pay rent now, when the baby comes, they will be down one income for a bit and then have child care, so will likely have more problems.