I have a niece the same age as Ronnie and will say she has never put anything in her mouth she is playing with, has recently started played with her older cousins dollhouses/Sylvanian families without issue when at other my other siblings' houses, but cannot imagine her having it in her own 'play space' at her own home where she may not be getting constant supervision as her mum tries to get some housework done, etc. as she plays. There she has one of those big blocky type dolls houses. It isn't her toy, and she knows when she is playing with her cousins' toys she plays 'gently and carefully' or she doesn't get to play with those toys (and I have no doubt her cousins would be quick to clipe on her if she did anything they didn't like).
If she is planning on giving that to Ron this year for Xmas, we'll I have no words. Whilst I think it is nothing more than what's she wants to do for herself and it is providing some inane content that allows her to continue to avoid cleaning, I do worry she is stupid enough to give him it soon. Even if Ron potentially hasn't shown any interest in putting toys in his mouth, she is about to potentially have another child on the move (unless she plans on completely inhibiting that and keeping him strapped in somewhere) and what's to say it won't get pulled over by either kid, or Ron gives the baby pieces, the dog knocks it, etc. It's not like there is a huge age difference between the kids where you have an older one well warned to be careful of playing with tiny toys and where they put/leave them to make sure a baby doesn't get them, Ron isn't old enough to understand that. At least with an age appropriate house and furniture the him dropping pieces, or throwing them, accidental knocks, etc. doesn't then risk a baby crawling and finding tiny pieces right at their level...unless she plans to be a complete helicopter and he isn't going to get to touch bits and the moment it looks like he might mess it up the whole thing is taken away.