Our household was always so lively when my grandmother was alive, but now that she has passed away, everything seems to be a little gloomier at home.
この場合、次のような言い方ができますよ。
ーOur household was always so lively when my grandmother was alive, but now that she has passed away, everything seems to be a little gloomier at home.
「我が家は祖母が生きていた時はいつもとても明るかったが、彼女が亡くなった今、家はちょっと暗くなった」
Everything seems to be a little gloomier. で「すべてがちょっと暗いようだ」
ご参考まで!