Prince George and Princess Charlotte are taking their cousin-ly duties VERY seriously!

The brother and sister have really taken to bonding with their adorable two-month old cousin, Archie Harrison Mountbatten-Windsor, according to a source who spoke to Us Weekly this week about all the young royals and their loving childhoods together!

Related: Prince George Can’t Wait For His Sixth Birthday Party!

According to the source, George and Charlotte both “dote” on Meghan Markle and Prince Harry‘s son, with Princess Charlotte especially fond of the adorable little guy! The source expands (below):

“They dote on him. Charlotte treats Meghan and Harry’s son like a little doll and is always asking after him … They have a blast playing together, and [they] include him in their activities.”

Awww!!! That’s so heartwarming!

It’s so adorable that those two would think to include Archie even while he’s so young… sure, he can’t do much yet considering he’s just a few months old, but knowing there’s love there already is SO cute! Good cousins!!

meghan markle introduces archie
Prince Harry and Meghan Markle’s little bundle of joy is already getting a TON of cousin love! So great! / (c) CBS News/YouTube

When it comes to playing, the two elder cousins aren’t afraid to mix it up with each other, either, with Charlotte not hesitating at all to follow George’s lead with sports, according to the source (below):

“Charlotte’s a bit of a tomboy and loves climbing and sports. Although Charlotte’s much bossier than George, she looks up to him. They squabble over small things like toys, but the majority of the time they get along.”

Love it!

Considering George will soon turn six years old (Monday is the big day!), and Charlotte just turned four, we certainly have a long time to go hearing about the exploits of these royal cousins — and you can be sure we have plenty of swooning and obsessing left within us about ’em, too! Ha!!!

Related: Kate Middleton’s ‘Back To Nature’ Garden Works Out Perfectly For This!

Besides, it’s only a matter of time before Archie really joins the fray in a few years — and we can’t wait to hear how he (and Prince Louis, who just turned one) settle in alongside their older relatives and mix it up as the formidable royal four! Catchy and cute!!

What do U think about all this cousin love, Perezcious readers?! Sound OFF about everything royal family-related and more in the comment section (below)!!!

[Image via WENN]