One year after Heidi Klum and singer Seal said auf Wiedersehen, the Project Runway alum decided she needed a new space of her own, so she shelled out $13.6 million for an 11,000-square-foot California home in 2013. It’s there, in the upscale Bel-Air manse, that she’s raising her and her ex’s four children – daughters Helene, 14, and Lou, nine, and sons Henry, 14, and Johan, 12. Though they all have busy schedules, the model’s revealed that she and the kids still make time to enjoy their meals as a family. ‘No-one ever wants the same thing, so I feel like I’m a line cook,’ the 45-year-old jokes of preparing dinner, which she says she does every night. ‘At six o’clock, we sit together [and] that’s when everyone talks about…