Liam, 42, tweeted a picture of himself with a backstage pass around his neck to "Noel Gallagher's High Flying Birds' Keep It Dangerous" tour, writing "Keeping it in the family...LG".
It was unclear if and where he joined the band at a concert.
Last Saturday, the band played a gig in Milan and they played the O2 Arena in London.
There was no reaction from Noel on Twitter after Liam's photo.
Noel walked out of Oasis in 2009 after arguing continuously with Liam.
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