Upvote:3
As explained here by Gayot Fow, you have to show your bank statements. If you show nothing, they will assume that your finances look even worse than they do.
And you have to convince the UK that you will return to Algeria after your visit. Having more sponsors doesn't help to do that. Morey ties to the UK and fewer ties to Algeria are a reason for you to stay, after all.
It is not impossible that all of you will get visa. Think it through -- where does the money for the trip come, and what are you returning to. Can you explain why you will leave the UK without problems? Does you grandmother have investments, real estate, or a pension?