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Everything that Sandberg said is true — you need a good partner and support system to Lean In. But that doesn’t have to be a husband. There are lots of people that you can Lean On so that you can Lean In.
If you are financially and emotionally supported by the father of your kids and you all live under the same roof, even if he is a frequent flyer or he likes weekends away with the boys, then you are NOT a single mother.