How about Mr. and Mrs.
Just address the card to Mr and Mrs (husband's name). It's perfectly okay to address the husband and wife but to avoid offending the wife just do the Mr and Ms last name and you're probably safe.
Type your answer here... Mr. and Mrs. Mark Henderson
If not directing the card specifically to the daughter in this case, usually you would address to "The Family of [deceased]".
addressing attorney and wife
If it was one of the parents of the husband or wife's or child and you know the two people well you would put 'John & Jane' (the card says the rest) and sign it with 'My sincere sympathies to you and your family ____________. If the husband has passed away then address the card to the wife 'Jane' or 'Mrs. Jane Doe' and if it's the wife that died then address the card to 'John' or 'Mr. John Doe.'
No- that would constitute forgery. A wife cannot sign her husband's name to any legal document unless she was granted a Power of Attorney and states on the document that she is signing his name as his attorney-in-fact.
the wife
It is etiquette to put the wife's name first and inside the card put her name first and then the husbands (the deceased was his mother-in-law) so he should be included.
When a wife's parent dies, it is appropriate to address the sympathy card to both the wife and husband. This shows support for both individuals during a difficult time and acknowledges their relationship as a married couple. Additionally, offering condolences to both parties allows for a shared expression of sympathy and comfort.
Your estate will be responsible. Indirectly, you wife will either have to pay it or get a smaller inheritance.
Yes, because she's lost her mother-in-law.