Advice needed: owning/running multiple business

My parents started a business about 20years ago; about 10years ago I started working with them and was given 90% of the shares. Unfortunately I wasn't ready and decided to leave, but they kept my shars the same.

2 years ago I opened up a business with my partner, we each have 50% ownership.

My parents are ready to retire and want me to takeover the business, alongside my sister-in-law.

Parents business is: GC, permitting and plans My business is: custom millwork

Does consolidating these business makes sense? What would that look like financially ? Are there risks?

Is it better to just keep everything seperate ?

Any insight would be greatly appreciated