I think Madonna allowing Rocco and Lourdes onstage for her final Sticky & Sweet shows in Tel Aviv was brilliant and adorable and nothing more or less than familial glee and support.
Rocco danced enthusiastically during the DJ set pre-show as well as during the "Music" number:
...while big sis Lourdes danced to "Give It 2 Me" during rehearsals and the performance and credibly tickled the ivories during "Devil Wouldn't Recognize You":
Disgustingly (and hypocritically), the Daily Mail has a long, long, long piece decrying that Madonna is using Lourdes for publicity (via these and Lourdes's appearances in both "Celebration" videos), even going so far as to suggest Lourdes has been somehow inappropriately dressed for a pre-teen (not for long) girl. The "Like a Virgin" costume should hardly raise an eyebrow—it's not like she's all dolled up as Dita, asking to be your mistress tonight.
Then, the piece asserts that Madonna is/will be competitive with her daughter for attention, using old and tacky quotes from Madonna's old and tacky turncoat brother Christopher to bolster the claim even though li'l Christopher was once the all-too-eager beneficiary of the spill-overs of Madonna's fame, too.
Relax, it's all in good fun.