The Sims 4 Suggest Adopting a Child Interaction
Tested for patch 1.84 (2/15/2022)
Attention After I submitted this mod a few days ago I found a bug and fixed it but was not able to replace or cancel the upload. If you downloaded the mod just after it went public please download it again, I just updated the file. The bug was that the interaction did not work, if it took place outside of the target Sim’s home lot.
Since the “Discuss Expanding the Family” interaction is just designed around pregnancy and does not work for gay couples or single Sims, I added a new interaction which lets your Sim suggest to another Sim that they might adopt a child.
Mod Functionality
This mod adds a new interaction “Suggest Adopting a Child” that can be found with the friendly interactions.
If the interaction is successful a random toddler or child will be added to the target household 
The toddler or child will be added to the family tree and the target Sim and their significant other (if there is one) will be set as parents.
Every Sim can suggest an adoption but only YA or Adult Sims can be the targets of the interaction. Your Sim has to be friends with the target Sim.
The suggestion will not always be successful and the Sims will get moodlets depending on the result. Sims with the trait “Family Oriented” will be affected more, both positively and negatively, but they will also be more successful.
Credit : flauschtrud