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Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (find posts on this subject here and here (thanks, @chirlu)), for personal use, these rules are rather loose – especially in special circumstances. Writing the infamous mit freundlichen Grüßen would – to my ears – sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing Euch, though. It’s optional for du/Du and euch/Euch nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.

Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (find posts on this subject here and here (thanks, @chirlu)), for personal use, these rules are rather loose – especially in special circumstances. Writing the infamous mit freundlichen Grüßen would – to my ears – sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing Euch, though. It’s optional for du/Du and euch/Euch nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.

Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (find posts on this subject here and here (thanks, @chirlu)), for personal use these rules are rather loose - especially in special circumstances. Writing the infamous "Mit freundlichen Grüßen" would - to my ears - sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing "Euch", though. It's optional for "du/Du" and "euch/Euch" nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.

Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (find posts on this subject here and here (thanks, @chirlu)), for personal use, these rules are rather loose – especially in special circumstances. Writing the infamous mit freundlichen Grüßen would – to my ears – sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing Euch, though. It’s optional for du/Du and euch/Euch nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.

Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (I'm sure there is a post here on this subject somewhere, I'll check & edit...), for personal use these rules are rather loose - especially in special circumstances. Writing the infamous "Mit freundlichen Grüßen" would - to my ears - sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing "Euch", though. It's optional for "du/Du" and "euch/Euch" nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.

Why not?

You are writing a personal, heartfelt letter, so feel free to use personal, heartfelt words.

If you were writing a formal letter sticking to formalized greeting would be advisable (find posts on this subject here and here (thanks, @chirlu)), for personal use these rules are rather loose - especially in special circumstances. Writing the infamous "Mit freundlichen Grüßen" would - to my ears - sound odd.

As it stands, I see nothing wrong with your suggestion.
Consider capitalizing "Euch", though. It's optional for "du/Du" and "euch/Euch" nowadays, but elder people will have learned that in letters capitalizing personal pronouns is mandatory.