Is a wife sinful if she avoids her husband due to his bad manners and temper, and prefers to sleep with her children, even though she does not refuse him any permissible request?

If the wife does not deny her husband his right to the bed and obeys him in what is good and permissible, then there is no blame upon her for sleeping with her children or for reducing her time sitting and talking with him. The wife is advised to strive to reform her husband so that he becomes a righteous husband who treats her kindly and cooperates with her in obedience to Allah the Almighty. This requires seeking Allah's help, patience, and wisdom.