"Mom, I Think......" joke

It seems that a young couple had just gotton married and spent their
wedding night with the young mans parents.
In the morning the mother got up and prepared a lovely breakfast, went
to the bottom of the stairs and called for them to come down for
breakfast. After a long wait the family ate without the newlyweds. The
mother said "I wonder why they never came down to eat."
The groomes young brother said "Mommy, I think..."
"Oh shut up I don't want to heat what you think!" said the mother, not
wanting to hear any inappropriate comments from the younger brother.
At lunch time the mother again prepared a wonderful meal and again
called the young couple to eat. After another long wait the family
proceeded to eat, and after the meal was completed the mother once
again said "I wonder why they never came down to eat?" Once again the
younger brother started to speak, but was interrupted by the mother.
At dinner time once again the mother cooked a very elaborate meal, had
the table set perfect and called the newlyweds to join the family for
dinner. After another long wait the mother once again questioned why
they had not come downstairs all day.
The young lad once again said "Mommy I think..."
"Well what is it that you think?" asked the mother rather irritated.
"I think that when my big brother came down to get the vaseline last
night, he got my model plane glue instead."