The singer treated his kids to a luxury flight home after their break in Ibiza.
Molly, 21, was joined by her half-brothers Gene, 17, and Lennon, 18, for their first family holiday all together.
She shared a picture of the group, which also included Liam's girlfriend Debbie Gwyther, standing in front of their private jet.
She captioned it: "S*** forgot the milk."
Liam, 45, also shared a snap of the fancy plane on his Twitter page, seemingly hitting back at suggestions he might have blown his Oasis fortune over the last few years.
He wrote: "If this is what skint and desperate looks like then kiss my arse you B***BAGS as you were LFUKING x."
Liam also dropped a major hint to estranged brother Noel – telling him and his family to "get involved".
He tweeted: "Had the best family holiday ever cmon Noel Sara Anais Donovan sonny you know you want to get involved as you we're LG x."
Molly, who met Liam for the first time in May, gave her followers an inside peak into the luxury property in Ibiza where she was staying in with the rock star,
She captioned the snap: "Laying it on factor 50 thick."
In another post, Liam's eldest daughter could be seen petting a dog while wearing a black lacy top, denim shorts and a bum bag.
A picture shared on her Instagram Story showed her hanging out with Liam's son from his first marriage to Patsy Kensit, 49, and his son from his second marriage to Nicole Appleton, 43.
Liam and Molly were shown jetting off on holiday to spend some quality time together last week.
The model posted a picture of herself with Liam and his girlfriend Debbie on a private jet on the way out.
Molly was born in 1998 following his relationship with Lisa Moorish.
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