The rumor about Ernst and welfare is overreaching for a number of reasons. In addition to the meaningful difference between a farm subsidy and what might be recognized as welfare, there is also a conflation of numbers. Ernst's father (and, it should be noted, not the senator herself) is listed as a recipient of less than ten percent of the $460,000 figure mentioned in the rumor. The balance is attributed to her late great-grandfather and her uncle, Dallas Culver. Sen. Ernst may or may not be close to her uncle, but it's quite a stretch to suggest his agricultural subsidies benefited her in any meaningful way.
Even then, there's an issue of chronology that cannot be overlooked. Those who cling to the proposition that Ernst was happy to put her hand out when subsidies came her way while looking down upon others' receiving help would have to acknowledge the dollar figures reviewed for the claim come from farm subsidies granted between the years 1995 and 2009. Ernst was born in 1970; and by 1994 she had graduated college, been commissioned as a Second Lieutenant in the Army Engineer Corps, gotten married, and moved to Savannah, Georgia. It's safe to say she was no longer a member of her parents' household in 1995 or later and thus was not a direct beneficiary of the referenced federal farm subsidy programs.
Moreover, Ernst's father received only about $39,000 in farm subsidies across 14 years, or $2,785 per year on the average: a sum of money that would be useful to most Americans, but not enough to make or break a business in one year. More than 90% of the monies cited in the claim went not to any of Ernst's direct relatives, but to an uncle.