Answer :
The best way to complete the given sentence is to add the phrase:
- Would be well looked after
According to the given sentence, we can see that there is a dialogue between two people about the welfare of a child and the possibility of getting a babysitter.
As a result of this, the best way to complete the sentence would be to add that the baby brother would be well looked after.
This is because, the second speaker already disagreed with the idea of a babysitter and stated that her brother would be well looked after.
Therefore, the best answer would be "Would be well looked after"
Read more about dialogue here:
https://brainly.com/question/24787390