I must admit that I have never heard that the prayers of those in Purgatory can assist us. Sounds a bit selfish gaining from their suffering when we should be praying for them to alleviate their suffering. When they get to heaven may be the time for them to put in a good word for us. I must admit to praying to Jesus mainly as the One I have failed and to Our Lady for disappointing her and for her intercession. I don’t pray for things anymore, just forgiveness. He must get very bored with my poor continual grovelling, but it is all I am worth, and just want Him to recognise me on the Last Day. "Oh yes,that Peter, I recognise him from his irritating sniveling. I told him seven times seventy that I had forgiven him, but he wouldn’t let it go. " A few others who could vouch for me will not go astray.