I hope I am at the right place. I believe this show was in the early to mid 80's and lasted maybe 1 full season.
I cannot remember any of the actors or the title. I do remember that it had 2 young (pre teen to teen age children). In real life one of the girls died. No it is not My Sister Sam. I think the girl died from Cancer or some kind of illness. I remember that the show opened with the father flying them in a helicopter over a large open field.
I was hoping someone would remember this show and could tell me what the name of it is. I remember enjoying this show and watched regularly and then it just disapeared. I was young at the time and cannot remember any more about the show.
Thanks!!!!!

Was this show a sitcom or a drama? And do you recall any of the actors from the show?

I believe it was an hour show but not a real drama more like Magnum PI type show.

I know this is a long shot, but could the show you're thinking of have been "Lime Street"? There was a girl on the show who played the daughter of one of the main characters, and the actress died in real-life in a plane crash.

You are excellent!!!!!!!! Thank you so much...Great memory, thought I was going crazy cause no one I talked to even had a clue what I was talking about, everyone kept telling me I dreamt the show up or I was confusing it with the show My Sister Sam.
Oh Thank You!

Glad I could help! :)

LIME STREET

21 September 1985 - 26 October 1985 ABC

This hour adventure series came to an unexpected, and tragic, end after just five episodes. It starred Robert Wagner as James Greyson "Grey" Culver, an investigator for the London Insurance Company who lived on a horse farm in Virginia with his two daughters. Featured were John Standing as Edward Wingate, Grey's London based partner; Samantha Smith as Grey's daughter Elizabeth; Maia Brewton as Grey's daughter Margaret Ann; Julie Fulton as Grey's assistant in Washington DC, Celia Westfall; Anne Harvey as Evelyn, the housekeeper; and Lew ayres as Henry Wade Culver, Grey's father. Young costar Samantha Smith had achieved fame not as an actress, but rather as the schoolgirl who wrote to Soviet leader Yuri Andropov urging peace and who had been invited to visit the USSR. Sadly, after four episodes of Lime Street had been filmed Samantha and her father were killed in a plane crash on their way home to Maine. The producers decided not to recast her role, but to stop production on the series.