In my opinion, I think 27 sounds like a wife and a child. Lol if it’s read 儿妻 but even if I get it wrong for number 2, I’m sure that the 7 means wife!!!
27 in chinese is er-qi, the sound is very similar with 爱妻 ai-qi meaning 'beloved wife'. You guy may confused how 'er' similar to 'ai', but that is chinese... Even 520 (wu-er-ling) sound like 'I love you(wo-ai-ni)' in chinese ears. lol
I honestly think it's like this
2 is er, it can be use as a term for endearment and 7 is qi, qi zi means wife, qi by itself is similar as well. So it's dear /precious/etc wife.
Moy_1314