It is true that although there are many families that prefer to resort to a woman of the family like a sister, aunt, sister-in-law, cousin, daughter, etc., not all are benefits in this type of agreements. The other side of the coin is that it can damage the long-term relationship.
If any complications arise during and/or after pregnancy, the stress generated can trigger feelings of resentment or even bring up past problems between family members.
This is why it is also recommended that both the pregnant woman and the intentional parents be evaluated psychologically and emotionally by a specialist in order to identify possible feelings or intentions that could damage the relationship or even have a negative impact on the welfare of the future baby.