I have not been on mother's day. But best way to beat the lines is download the Disney app. There is a fast pass option. Where you can reserve your spot before you get to each line.
Sunday's are always busy. Im sure even more busy since its Mothers day.
I haven't been on mother's day, interesting it was much busier the day after President's day. Need to check the Disney app.
Thanks! Your answer is awaiting moderation.