be kind to each other and love each other ? 祝你們兩口子～，白頭偕頭。May you couple be kind to each other and love each other and remain devoted to the end of your lives.
相親相愛xiānɡ qīn xiānɡ ài
形容彼此互相親近和愛慕。love each other, be kind to each other and love each other, be deeply attached to each other