Ring advice Please!!!

I wanted to see what your opinions were about me changing my engagement ring. We got engaged over two years ago with a ring i hinted i wanted and still love dearly. It’s a solitaire .5 ct old mine cut stone. I know this is not traditional but really prefer just having one ring so i wanted to add a couple stones and keep the setting to my e-ring. We figured on just upgrading my current ring and making that my wedding band as well… My fiancé loves the idea of designing a ring together with the original diamond as a side stone so i can go a different shape/size in the middle and find a matching .5 ct for the other side. I am so in love with the meaning of the three stone rings so i know i want to do that. I just don’t know if this is going to go over well with his family…. i feel they are a close knit extremely judgmental family and all married or divorced so i know they are going to have comments, especially because some commented on the size of my engagement ring when we first got engaged..this is going to be a pretty drastic change and I’m wondering if you think i should tone it down and use my stone as the center instead of getting a larger one or even just doing a wrap with two side stones? I know it bothers them i am an at home mom so they may wonder about money??? i dont know, My fiancé is a hundred percent okay with this and knows the price of what is will cost all together and it’s within his price range and i am DEFINITELY not the type to go beyond our means…i think I’m just worried about how it will be conceived . Please let me know what you think.