Both of these boys are good looking, really sorry to hear you aren't considering taking them both. IMO, there is very little difference in having two vs. only one. It's not that much more work and it gives the dog a playmate.
I use to help a GR Rescue with Intake-here are a few questions you may want to ask especially since you have young children. These are some questions that were on the Intake form of the group I helped along with the ones you've already asked.
Have these dogs been around children? If so what ages? How did they act around children?
Any bite incidents, if so, get as many details as possible.
Can you take toys, bones/chews, food from them without any agression being shown?
Are they afraid of anything such as storms, fireworks, etc. and what is their reaction?
There are a lot of advantages of taking an older dog, I adopted both of mine at the age of 2. My girl is from the GR Rescue I use to help, she turns 8 this month. I found my boy last year at my County Humane Society. You don't have to deal with house breaking and the puppy issues. If these dogs have been trained, which it sounds like they have had some training, you are going to have a dog that is well behaved and well mannered possibly. Goldens require a lot of exercise, I hope you've got a plan for play time and daily exercise such as long walks.
If you decide to take one of them, give the dog several weeks to relax, adjust to a new environment. Some dogs take longer than others, some dogs fit in right away. That was the case with my boy that I adopted, it was like he'd always belonged.
If you decide not to take one or both of these dogs, could you give the owners the info for the Golden Retriever Rescue that covers your area.
Here is the link for the National Golden Retriever Rescues, click on the State, a list of Groups will come up. Contact the Groups in your area. National Rescue Committee of the Golden Retriever Club of America
Best of luck to you.