The mother-son relationship in D.H. Lawrence's novel ‘Sons and Lovers’ is central to the narrative and is characterized by complexity, intensity, and psychological depth. The primary mother-son relationship in the novel is between Gertrude Morel and her two sons, Paul and William. 

Intense Bond: The relationship between Gertrude and her sons, particularly Paul, is deeply emotional and intense. Gertrude has a strong, almost possessive attachment to her sons. She invests much of her emotional energy and hopes in them, wanting them to achieve the success she has been denied.

Paul's Oedipus complex: Paul's relationship with his mother borders on the Oedipus complex, a concept from psychoanalysis. He is emotionally attached to Gertrude in a way that goes beyond the typical mother-son bond. This attachment influences his relationships with other women and his struggle for independence.

Conflict and Ambivalence: While the bond between Gertrude and her sons is strong, it is also marked by conflict and ambivalence. Both Paul and William feel the weight of their mother's expectations and desires for them. They are torn between their love for her and their desire for independence.

Impact on Relationships: The mother-son relationship significantly influences Paul's romantic relationships. He often finds it challenging to fully commit to a woman due to his unresolved feelings for his mother. His emotional and psychological entanglement with Gertrude affects his ability to have a healthy, adult relationship.

Mrs. Morel's Influence on Their Choices: Gertrude's influence is a driving force behind many of the choices her sons make. She is a dominant presence in their lives, shaping their aspirations, relationships, and decisions.

Conflict and Jealousy: The relationship between Mrs. Morel and her sons leads to tension and even jealousy when it comes to their interactions with other women. She is often suspicious and protective of her sons' romantic interests, which creates conflict.

Tragic Consequences: The novel explores the tragic consequences of the intense mother-son relationship. It has a profound impact on the characters' emotional well-being and choices, leading to emotional turmoil and ultimately tragic outcomes.

The mother-son relationship serves as a vehicle for D.H. Lawrence to delve into complex psychological and emotional terrain. These relationships illuminate the struggles, tensions, and deep connections within the Morel family and provide a rich source of exploration of love, desire, and the dynamics of family life.