Could it be that the children spent most of their day in a creche?
Yes it seems so.
On Tuesday there was a slight change given that after lunch, at 13h30, he and KATE decided to take the three children to Paris da Luz, having gone on foot, taking only the twins in baby carriages. They all left by the main door due to the carriages, went around to the right, down the street of the supermarket and went to the beach along a road directly ahead.
----- They were at the beach for about 20 minutes, the deponent and MADELEINE having paddled in the water. During this time the weather changed with a cloudy sky and cold, they went to an esplanade of a cafe next to the beach, on the left, where they bought five ice-creams and two drinks. Asked, he said that at that place there was an individual playing Latin music on a guitar to whom he intended to give some coins, but having none at the time, he didn't. (GM 10 May)
Her parents were required to sign the register when the meal was over. During the meal Kate asked Madeleine if she was sad because the other children in the group had gone to the beach without her: she replied that she wasn't, but was rather tired. She asked Kate to carry her back to the apartment. Kate agreed, and Gerry led the twins back to the apartment. Tiredness was due to the intense daily activities, not to any sickness.
They arrived at the apartment around 5:40PM, earlier than usual, because Madeleine was tired, their other friends were at the beach and Gerry had an all-male tennis game at 6:00PM. (KM 6 Sep)