Imaam Muhammad bin Saaleh Al-Uthaymeen [May Allah have mercy on him] said:
“Whoever does not fulfill the obligations which Allaah [The Mighty and Majestic] has obligated on him with regards to nurturing his children [upon piety etc], then it might occur later on that they will not fulfill the obligations which Allaah has obligated on them to fulfill towards him [i.e. the father] when he reaches old age and [when] he dies. “
Sifat Us-Salaah page 27