The Snopes breakdown on this is interesting:
Claim
A photograph shows Ivanka Trump grinding on the lap of her father, Donald Trump.
Rating
Mixture
What's True
A 1996 photograph was captioned as showing a 15-year-old Ivanka Trump sitting on her father Donald Trump's lap during a concert at their Mar-a-Lago estate.
What's False
The photograph does not in itself document any 'grinding' or other inappropriate physical activity between Ivanka and her father.
https://www.snopes.com/projects/fou...tm_campaign=fm2020&utm_content=support-snopes
Origin
In September 2016, a photograph purportedly showing a 15-year-old Ivanka Trump “grinding” on the lap of her famous father, Donald Trump, during a Beach Boys concert in 1996 at the family’s estate in Florida was circulated by web sites such as
Winning Democrats as looking “too much like a girl grinding on her boyfriend’s lap”:
Although this photograph is genuine, it is not in itself evidence of some form of improper relationship between Donald Trump and his daughter. While some may view this image as evidence that Trump has a “creepy obsession” with Ivanka, others see it simply as a picture of a father and his teenaged daughter enjoying a concert together.
This photograph was published by
Getty Images on 1 January 1996 with the following caption:
We note that this picture captures a fleeting moment, and without additional photographs (or video) of the event, it’s impossible to say whether Ivanka was sitting on her father’s lap for a prolonged period of time or for just a few seconds (or whether, despite the captioning, she was actually on his lap at all).
While late-night comedians have frequently mocked Trump for having an improper relationship with his daughter, those accusations are all based on speculation rather than solid evidence.
A photograph showing Ivanka Trump seemingly sitting on her famous father's lap documents less than is salaciously claimed.
www.snopes.com