或许、可能、也许、碰巧、如果我没弄错的话

1. perhaps, possibly, maybe, by any chance, if I'm not mistaken

adverb (fukushi) word usually written using kana alone

如果；假如；倘若

2. if, in case, in the event that

adverb (fukushi) word usually written using kana alone

もしかして、以前は兄弟だったんではないですか。

tbd