Evelyn,
 That reminds me of when my sister was gonna take my mom home for a
week.110 miles away and soon after getting home they had to turn
around and bring her back. Barb

Evelyn wrote in part - >Brianna, traveling with a person who has alzheimers
is >pure hell.   {another partial snip} Your sister would be wise not to go
on any >real trips with him."

In my retirement, I work part time at our local major league baseball
stadium.  We have an established routine for locating lost individuals
and/or misplaced parents/escorts.  The most scary are the times we are
trying to find an Alzheimer's patient who, for whatever reason, has been
left to his/her own devices for a time - often for 5 minutes or less.

One particular afternoon, the staff heard repeated requests over the radio
to locate a woman, now on her own, who suffered from Alzheimers.  We had
detailed descriptions of what she was wearing.  A flowered skirt and a
purple top.  Our team colors are purple and black.  Can you guess how many
women of late middle age come to the ball park wearing flowered skirts and
purple tops?  Hundreds.  It was 3-4 hours before someone spotted her
wandering around alone.

She was finally located in one of the luxury seating areas, clear across the
stadium from her ticketed seat, without a ticket for the area where she was
found, and how she evaded the ushers who check tickets for persons arriving
in that area remains a mystery.  The staff of the assisted living area who
brought her to the stadium were quite concerned, and also mystified on how
she eluded their supervision.

This event, which fortunately had a happy ending, scared me quite a bit.
This woman had come, in a group, with several trained staff members
supervising, and with other attendees at the game in the group.  She still
managed somehow to wander away, she did not have a ticket with her, and was
unable to answer staff questions when they did find her.  This, of course,
was the important fact which put her back in the company of the supervising
staff from her facility.

Contemplating your sister, on her own, away from home, with her own needs to
eat, sleep, visit the bathroom seems as Evelyn said - a trip to pure hell.
Remembering my own level of discomfort that afternoon at the ballpark, when
I didn't even know the person we were looking for makes me regard the
prospect as a nightmare.