「家書」

(pos:名詞)
<explanation>
yue:屋企人之間嘅信（量詞：封）
eng:letter to or from home
<eg>
yue:到埗之後記得寫封家書報平安呀！ (dou3 bou6 zi1 hau6 gei3 dak1 se2 fung1 gaa1 syu1 bou3 ping4 on1 aa3!)
eng:Once you have arrived, remember to write a letter to us to let us know you're safe.