Help me write a paragraph telling my boyfriend’s mother that “ thank you for everything that you’ve done that may family couldn’t done it for me” It mustn’t be a formal one but a formal one

Hey, [Boyfriend's Mother's Name], I just wanted to take a moment to express my gratitude for everything you have done for me. Your kindness and support mean so much to me, and I want you to know how much I appreciate it. Thank you for all the things you’ve done for me that my family wouldn’t have been able to do. You are truly a special person, and I am so lucky to have you in my life. Thank you for everything.