You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Who was the second husband of the sister of Ulf Tostesson?" whose answer is Sweyn Forkbeard.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Ulf Tostesson family members
Useful Output:

Doc 1: Ulf Tostesson is said to be a "jarl" and the son of the legendary viking Skogul Toste. He was the brother of Sigrid the Haughty, and his son,
Doc 2: Immediate Family: Son of Småkonge Skoglar Toste Husband of Ingeborg Father of Ragnvald the Old, Earl in Västergötland Brother of Sigrid the
Doc 3: Most obviously, carers and family members can experience increased mental health problems, financial distress, and disruption to work
Doc 4: Ulf was married to Estrid about 1015-1016, daughter of Sven Tveskæg and sister of king Knut/Canute. They had at least two children; Svend and
Doc 5: Ulf Tostesson was a jarl and the son of the Viking Skogul Toste. He was the brother of Sigrid the Haughty, and his son was Ragnvald Ulfsson.