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I think it's because by calling the parents Mr. and Mrs., it shows more respect towards the family
Jana and John-David Duggar are 25-years-old and Jedidiah and Jeremiah Duggar are 16-years-old.
Mrs Duggar teaches her children to be; Attentive Obedience
The Jim-Bob Duggar family of Arkansas. Mrs. Duggar is expecting child number 19!
Joseph Duggar (seventh Duggar sibling) is 22 years old (born January 12, 1995).
Grandpa Duggar was 73 years old when he died.
In 2012, Michelle Duggar was 46-years-old.
Meredith Duggar is 1 year old (born July 16, 2015). She is the 4th child of Josh Duggar.
Marcus Duggar is 4 years old (born June 2, 2013).He is the 3rd child of Josh Duggar.
Josiah Duggar is 18-years-old.
James Andrew Duggar is currently 13-years-old.
James Duggar was 3-years-old in 2004.