According to Raja yoga, the ultimate goal is to achieve self-realization and liberation from the cycle of birth and death. This can be achieved by the practice of meditation, ethical conduct, and devotion to a higher power. Having children or starting a family may distract from the goal of spiritual progress.
In Raja yoga different practitioners may have different beliefs and practices. Some may view the concept of not having children or remaining a bachelor as a personal choice, rather than a strict requirement. Others may believe that it is acceptable to have children or adopt, as long as it does not interfere with one's spiritual progress.
In Raja Yoga it is recommended to retain the existing family members and not to add more new relations by means of becoming a parent ourselves.
Ultimately, the decision to have children or adopt is a personal one and should be based on individual circumstances and beliefs.