What does this below rebus puzzle mean?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

There is a place where if I stand up straight, I will still be considered sideways.

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

What can you deduce from the following BrainBat?

CRY
LMKI

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

The cream is heavier than Milk. True or False?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Can you find a five letter word that is left with only two letters if one is removed?

John was drowned by he was not wet. How?