Réponse :
Dear family,
I know that I have been away for a long time, but I got offered a job here in Canada and I couldn't deny it. this job is super important and if it goes well, then it will change my whole life for the best!
I'm aware that you understand my situation, but I feel so guilty about leaving on the day you're moving out to a new house. I really would have loved to help you, but as I explained earlier in this letter, it would just be too stupid of me if I declined!
Anyways, I had only managed to free up a little bit of time before going back to work. So I'll just say one last thing: I hope you're all doing well and I miss you so much!
Love from (ton prénom).