Letting my husband have a baby?

Okay well for about 7 years and thousands of dollars later, i havent had success in getting pregnant . i have been married for 13 yrs, and u can only imagine how empty my 2 bedroom apt feels, adoption? waaaay expensive. foster care? in the process but its not a stable situation. sooo here it goes. my husband begged for a child and i had 2 choices leave him or find an alternative way. well the alternative way found its way.....she a 23 year old mother of 2 , a boy and girl, and she volunteered to have my husbands baby and give it up to us, giving up her parental rights so that i may adopt the baby. the baby will be concieved the old fashioned way. it may be crazy and way unconventional but in the moment of desperation this is the only way to go.