The family in Washington?

In the early 1940's, Dad worked construction in the Pacific northwest. The picture is, I believe, from the time when we lived in a part of Vancouver, Washington
called MacLaughlin Heights (I may have gotten the spelling
wrong). Tootie and I have tried to find the house, but I
suspect that it is long gone. It was a small house, very cosy,
though it seemed large enough for me. One memory I have
of this house is that mom would put us to sleep at night (T and I slept in the same bed) by reading poetry to us. I can still hear her reading The Highwayman and The Rime of the Ancient Mariner. She put a lot of drama into the poetry. I kept wanting the highwayman to get away, but he always got killed in the end. Judging from the photos, I was somewhere around four, and T was 2 1/2. On the back of the photo mom had written "Lou, Jimmie, Ronnie, and Elizabeth Ann." So, why does T get two names?