They tell a very specific story. I can see why everyone thought they were so great. Judging by those photos alone, they were a lovely happy family.
There are 83 pictures in this linked article
http://www.oregonlive.com/pacific-northwest-news/index.ssf/2018/04/post_296.html
I'll make some observations and point to specific pictures. As Starkville commented, these pictures do tell a specific story and paint the picture of a happy family. There are some pictures where the kids look genuinely happy. Unknown if the absence of any individual photos of Hannah and Markis is representative of the FB page or if this was an editorial choice by Oregon Live, but images of them are conspicuously absent. The chicken is featured in more shots than these two kids.
Many of the photos are from the past year or so and show the kids in settings outside of festivals and organized events, giving a sense of more balance to their family life. Most of the shots are carefully composed and some are clearly staged or styled, and as a professional photographer, I imagine that Jen shot multiple images of the same scene and selected the best ones for posting.
#7- Devonte, chicken in wading pool with a book and martini glass. Cross reference #73 of boys with wine glasses.
#8- Happy Mothers Day- one of the few pictures I've seen anywhere of a family holiday celebration. Probably taken in 2014.
#14- Sarah and Abigail on an amusement park ride. Relatively recent. Abigail looks genuinely happy.
#15- Jeremiah "giving" Devonte a haircut. Shot taken in West Linn home.
#18- Sierra laying floor in reading room (ref. #28 for finished room) of new home in Woodland. Notice how carefully staged and composed this photo is. Sierra appears to have much longer hair in this picture, given the volume under her bandanna.
#19- Devonte on a rider mower. No idea where this was taken or when. The home in West Linn was in a very steep and hilly neighborhood with smallish lots. The new home in Woodland is on 2 acres with some flat land, but not the type of fencing seen in this picture.
#22- Sierra, Markis and Devonte and the chicken- blackberry harvest. Probably taken summer 2017.
# 25. Devonte, Jeremiah and Abigail wearing eclipse glasses. The August 21, 2017 solar eclipse was 98% in Clark County, WA, but this picture seems to have been taken earlier.
# 27- Living room in new house in Woodland with Devonte using dog as a cushion for reading. Again, this is a carefully staged photo, most likely shot from a ladder or standing on a chair. The furniture in this room is not the same furniture that was in the West Linn living room from years earlier and the room looks immaculate. Room looks very grown up for a household of kids in their early teens.
#73- Jeremiah and Devonte with playing cards, wine glasses, a paint tin and orbital sander on an outdoor deck. I've seen this deck before and believe this is the West Linn house. But what's up with pictures of kids with alcoholic beverage glasses?
#77- Nice, relatively recent picture of Devonte and Jeremiah. They both look happy and relaxed in this portrait. The smiles appear genuine and not as forced as in some of the other posed pictures.
#79- Abigail, chicken in front of greenhouse with snow and paper whites. Taken within the last three months.
#81- Jeremiah, Devonte and Markis in the 2003 GMC Yukon. Notice that both Jeremiah and Devonte are wearing seat belts.
#82. Devonte with seedlings, taken March 2018 in Woodland living room.
There's still more new pictures in there, but I don't have comments for all of them.