"Sister Wives" patriarch Kody Brown celebrated his 7th anniversary with his fourth and legal wife, Robyn, this week. Kody and Robyn got married on May 22, 2010, in a grand wedding celebration that was featured on their TLC reality show. They have two children together: Solomon Kody, 5, and Ariella Mae, 1.

Meri pens a sweet greeting

When "Sister Wives" first started filming back in 2010, Kody had only three wives: Meri, Janelle, and Christine. His decision to have a fourth wife was heavily featured on the show's first season.

Robyn was a single mother with three kids, who Kody legally adopted.

Before he could do so, however, he had to divorce his first wife Meri Brown, and declare Robyn as his only legal wife. This caused a strain in the Brown household, which resulted in controversies, scandals, and more drama.

Meri doesn't seem to hold a grudge, though, as she was the first one to greet Kody and Robyn on their anniversary last Monday. Writing on Twitter, Meri wished them "a lifetime and eternity of happiness."

Sister Wives: where are they now?

Janelle and Christine did not join in on the public greetings, and neither did Kody. Since "Sister Wives" has not yet been renewed for another season, the polygamous family has been staying under the radar.

While fans may question whether there's trouble in the four households, second wife Janelle was quick to quash those rumors. On Mother's Day, she responded to a fan on Twitter who was asking if each wife celebrated the occasion separately.

"All mothers honored at our house," Janelle wrote. She also shared that Kody and all of their 18 combined children cooked for the four wives.

Kody did not publicly greet his wives on Mother's Day, but he did share a photo of the whole family together--something that their fans must miss terribly. The picture looked as if it was lifted from an old photoshoot, but the fact that Kody posted it means that all is well in their large and unconventional family.

Recently, Meri and Christine also shared a rare snap of the two of them together at Meri's daughter Mariah's graduation.

On that same day, Janelle's son Logan also graduated from college in a different state. Kody joined his second wife for the special event.

Meanwhile, Robyn, who has been visibly absent from social media, broke her silence to share the family's exciting news. Janelle's daughter Maddie Brown Brush just gave birth to baby Axel on May 20. Robyn obviously couldn't contain her joy, especially since this is the first grandchild for the polygamous "Sister Wives" family.

There is no word yet as to whether TLC will renew "Sister Wives" for another season. However, the network still plays past episodes on TLC Go and other outlets.