in your opinion was the influence of gertrude morel an influence for good or evil in the life of her sons?

I don't think it is a very good influence. Mrs. Morel is unhappily married to Walter Morel, and she redirects her attention to her children, her only passion in life. She is first obsessed with William, but his death leaves her empty and redirects her energies toward Paul. She bitterly disapproves of all the women these two sons encounter, masking her jealousy with other excuses. A natural intellectual, she also feels society has limited her opportunities as a woman, another reason she lives through Paul.