3965 - You can continue to write in French, as I personally open the letter and read French.

You have a fine son who will hopefully use his talents to benefit himself and his surroundings. Mazal Tov on your son's wedding. Make sure to continue supporting him, as much as he will gain from the Yeshivah, he will still need your help. Do it with joy. https://www.torahrecordings.com/rebbe/igroskodesh/012/003/3965