You liked the doll because you had a special bond with it. You are united with your spouse because you shared common ground with her; just like the proverb, birds of a feather fly together. In the same vein, her family is likely to share some similar traits like propensity to appreciate a certain doll because of its looks. Carl Jung said that eerie coincidences can happen because of acausal factors, meaning non-linking and non-causal factors can make the same event/ situation surface. Finding a rare childhood doll type in your in-laws’ home can be synchronicity of acausal factors.

Your dream of a shark gobbling up your doll could be a prophesy dream. Maybe while you were asleep, you heard audio stimuli of your doll being removed from your room, which may explain why you dreamed of losing it. Maybe you received other stimuli that were connected to the doll.

On another note, have you checked that doll in your in-laws’ home? Could it be your original doll? Maybe someone from your home removed your doll and somehow it ended up in your in-laws’ home?

People travel and take their belongings with them. The same doll could have traveled with them and ended up in another country.

Thanks for sharing your interesting anecdote.