You must remember that team leaders are responsible for helping new members join the team and recognize their potential. Using this question, the interviewers try to understand your communication skills and how good you are at building relationships in a team.  One way to answer this can be, "I always treat my new members the same way I treat others. I will schedule a meeting online or offline to introduce them to the existing team. I shall share my expectations and values to make them comfortable with the working environment. Sharing these values with the new member will encourage them to perform better and excel in their field."