I'm not an expert, but I'm sure something like this is just fine. The only suggestion I have is for your parents and in laws to share any specifics in as much detail as possible. (For instance "We've really enjoyed getting to know our daughter in law and have really bonded over our shared interests in X and Y." or "Angya is always so attentive to details about our life and always remembers to ask about X." Etc etc etc... I make that suggestion because I wrote a letter of support for my friend's US PR application and while it's a different process (and the letter I wrote was actually a requirement for her application as opposed to something you're adding as additional support) everything I read about letters of support said be as specific as possible - i.e. don't say "they're a great couple and really devoted to each other" say "I've seen their devotion to each other in multiple situations. For example, in situation X,... And in situation Y,....)@MJSPARV hey, would you mind check this letter, what do you think about this? this is what I'm planning to get from my parents, and similar to this from her parents. and i will also attach phone/video call history. please let me know your ideas and Thank you for your help.
We are Sponsor's parents, we are writing this letter to give you brief explanation on why we couldn’t attend my son’s wedding and also supporting his relationship with our daughter in law.
We both hold visitor visa to Canada, and we really wanted to attend our son’s wedding, but during second half of 2021, covid situation in India was very bad, we were not fully vaccinated and also flights were banned from India to Canada for non residents. We had no idea, how long it would take to get rid of covid-19 from both countries, so we allowed our son and daughter in law to have their wedding in Canada, we witnessed their wedding through video call, gave them blessings. They both are also planning to visit us in India sometime next year, 2022 during Christmas break or earlier possible.
Also, we would like to mention that Agnya is very sweet girl, she often video calls us and sometime we also have group audio/video calls with my son and daughter-in law. She is very caring and we are so happy to have her in our family.
Best wishes to you and your wife!