I need your help! Can you tell me the sentences that doesn't sound okay?

Ho who is one of my friends, he and his wife could not afford to take care of their son who is 3 years old because they had to do work in a same company. Thus, they had to ask their parents to take care of their son. However, it was so difficult for their parents to take care of the son because their age was about 70. Fortunately, their employer allowed one of them to do work at their home to take care of their son with taking turns. After that, their son could grow well and it was needless for them to worry about the son.