Mark Regev, a spokesman for Mr. Netanyahu, declined to respond to the families’ statements.

The flotilla, which was trying to break Israel’s military blockade of Gaza, was intercepted by Israeli forces in international waters when the vessels refused orders to turn back. When Israeli commandos boarded the lead vessel, a deadly fight broke out — Israel says the commandos were attacked first — and nine activists were killed, eight Turks and one American of Turkish descent.

The blockade has been loosened since then, and restrictions were further lifted under an Egyptian-brokered cease-fire that ended eight days of cross-border violence between Israel and Gaza in November. But travel, imports and exports remain at a fraction of the level they were before Hamas, the militant Islamic Palestinian faction, took control of the Gaza Strip in 2007.

Sari Bashi, the executive director of Gisha, an Israeli human rights organization, said while imports between 2007 and 2010 were limited to “essential humanitarian items,” now everything but construction materials was allowed in freely. Agricultural exports have doubled over the past three years, she said, but remain about 2 percent of pre-2007 levels because of a ban on sales to Israel and the West Bank.

Travel from Gaza into Israel through the Erez crossing has expanded from “exceptional humanitarian cases” to include some merchants, family visitation and attendance at academic conferences, Ms. Bashi added, and exiting through the Rafah crossing into Egypt is generally open to all.

November’s cease-fire agreement expanded the permissible fishing zone to six nautical miles off the Gaza coast, from three, and provided Palestinians access to land near the Israeli borders that had been closed off. But some Palestinians have been shot by Israeli soldiers in the border zones — the military said they had approached the fence — and the fishing limits have been restored recently after rockets were fired from Gaza into Israel.

“The loosening of restrictions was a response to the quiet,” said a senior Israeli official, who spoke on the condition of anonymity because he was not authorized to do so publicly. “The process that was going forward has not continued to go forward because of the violence.”

But for relatives of the flotilla raid victims, it is all or nothing.

“We want the naval, land and air blockade on Gaza to be entirely lifted, not some free passage of few more goods through the gates, before any talks with Israel could begin,” said Ahmet Dogan, father of the 19-year-old Turkish-American who was killed in the raid. “We are constantly in touch with people in Gaza and there is absolutely no difference in the status of the blockade.”