Doing this for myself, for my friends, for masochistic fun. But if you enjoy it or you find it helpful, be my guest. I'm aware of possibly pronouncing mistakes, but doing my best 😅
“Sinto SUA falta” sounds Brazilian Portuguese (notice that you have posted Portugalʼs flag). In European Portuguese, “sua” sounds too formal; to someone who is close to you, you would say “Sinto tua falta.”
Yeah, it wasn't easy to decide what exact word should I use. I also used "mom" instead of "mother" in a few other languages. It was also connected with popularity of used phrase and the way it sounds. ✌