Hello again Anna and thank you for coming back to ask me a follow-up question about your plans to visit Walt Disney World Resort in April 2016.
Perhaps only by consulting with Madame Leota from
The Haunted Mansion may we be able to predict crowd levels at this point in time for April 2016! However you are quite right when you say Walt Disney World Resort is rarely quiet these days; so we can at least count on that!
I've had a really good think about visiting during the month of April and the only other factor I can come up with other than those I mentioned in my previous answer is perhaps avoiding the American school
Spring Break crowds which include the weeks before and after Easter.
With this information in mind we can assume that mid and late April might be a practically perfect time for your dear family to visit Walt Disney World Resort.
Another great crowd predictive resource may be found by checking out websites like touringplans.com or similar.
If I can help you any further please pop back to ask me another Walt Disney World Resort planning question anytime.
Have a great Disney day.
~ Jane