。
The whole family is gathered happily around the low dining table.
Literal
Low-table [obj-を] surround-[and-て] one-family family-gathering-[doing-している].
チャブ台 (ちゃぶ台, written with the first element in katakana here) is a traditional low Japanese dining table that the whole family sits around on the floor — iconic in postwar Japanese domestic imagery. 一家団欒 is a 四字熟語 for 'family gathering in harmony,' a warm image of domestic togetherness. 囲む 'to surround' pairs naturally with 台 (table), 鍋 (hot pot), 火 (fire) for communal eating/warming scenes. ~ている marks the ongoing state.