The daughters of Keeping Up With the Kardashians alum Kourtney Kardashian and her fiancé Travis Barker are getting closer as soon-to-be stepsisters. Kourtney accepted Travis' marriage proposal in October after a few months of dating. Their future wedding will be a commitment not only to one another, but also to their merging families. Kourtney shares daughter Penelope Disick, 9, with her ex Scott Disick, along with her sons Mason, 11, and Reign, 6. Travis shares daughter Alabama, 15, and son Landon Barker, 18, with his former wife Shanna Moakler, who has reportedly had some sour feelings about "Kravis" getting together.

Kourtney and Travis recently showed off their latest getaway to Cabo San Lucas, Mexico on social media. Unlike their many other jet-setting dates to romantic destinations, this vacation included the couple's kids for some quality time as a new family. Kourtney even hit back at a mom-shamer online who claimed the reality star had ditched her kids since finding her new man, writing back that she is with her kids every day. Reports claimed the bonding sesh in Mexico went well for Kourtney and Travis' kids. Teenage Alabama was reportedly very sweet with Kourtney's little ones and hung out with the kids by the pool at their resort. Since their vacation, it seems Kourtney and Travis' families are getting even closer.

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A new video on Alabama's TikTok account blew up after she appeared alongside her future little sister Penelope in a viral video. One of Alabama's 1.6 million TikTok followers requested she make a video with P, who is a rising TikTok star herself on her new shared account with her mom. The cute video shows the pair lip-syncing to a Nicki Minaj song together. "When a girl treats you different when it comes to guys," Alabama captioned the funny clip. "Dang, little mama you is such a loser!" the duo lip-syncs together in a pretend diss.

Alabama Barker Instagram

Fans couldn't get enough of Penelope's appearance in Alabama's video. "Penelope is becoming the most popular Kardashian! She is the cutest," one TikTok user commented. Other fans noted their adorable relationship as a future family. "Little sister goals," one user commented. "P is so happy she has a big sis now," another wrote. Their video together earned 7.4 million views and over 1 million likes so far.

Beyond their raunchy PDA antics in front of paparazzi, Kourtney and Travis are dedicated parents to their respective kids. The couple appears to be committed to making their partnership work for everyone and their efforts are paying off in their big blended family. With Penelope's TikTok career quickly taking off, Keeping Up With the Kardashians fans can only hope to see Alabama return the favor for her new little sis and appear in another funny viral video.

Next: KUWTK: Scott Wants Kourtney's Happiness Even If It's Not With Him

Source: Alabama Barker/TikTok