Upvote:2
Are these strong grounds for a visitor visa, or is there any reason for rejection or suspicion? No, they’re not strong grounds. There are several weaknesses in the circumstances you describe. For example, no prior travel history (as you mention in a comment), and no ties to home (job, assets) apart from family. This question explains the likely outcome UK visa refusal on V 4.2 a + c (and sometimes 'e')
What can I do to strengthen this application? Nothing, if you’ve described the circumstances accurately. You can’t invent what doesn’t exist.
Upvote:2
No one can predict how your visa process will go, but judging from the vast majority of visa related questions - my guess is your visa will be rejected. You have to understand that the visa issuing authorities are assuming you are a "de-facto immigrant", that is, they are looking for reasons why you would likely break the terms of the visa (don't return, claim asylum, over stay) or rely on public funds.
It is on you to prove otherwise, and by you it is meant the traveler (in this case, your mom).
As written, your case is very weak as the primary deciding factor is your mom's travel history and circumstances; not yours.
This statement is the most concerning to me:
As my mom wants to travel alone, she leaves dad and brother back in India. We will be providing the ration card as proof that they are living in the same house. They will also write a sponsorship letter, and provide a property document in my brother's name.
I am not sure how this will help your mom's petition. How can they be writing a sponsorship letter, if you are the one paying for the trip?
A property in your _____ (brother, cousin, son, wife, etc.) name is not helping your mom's case. Typically such a document is used to provide ties to the place you are traveling from.
You mom saying that her son has property in his name is not really an incentive for your mom to return.
If you were traveling with your mom, things would perhaps be different.
My recommendation:
Have your relative in the UK (the one providing accommodation) write a letter of financial sponsorship. This letter must include costs they will bear, proof of their own economic status, and relationship to your mom.
This means that the relative (in the UK) is assuming the costs of your mom's trip; or that they are inviting your mom to visit them.
Again, as written its not a strong case.