Language Shift

The last months have seen a major language shift occur in our household. As we always expected Dutch  has gone from being an outside language which only entered family life through the television screen to being a living language in the home. Luna and Daisy now use Dutch as their primary language when they are speaking to each other though they do regularly code switch to Polish and very occasionally English. They have also developed a habit of incorporating Polish words into Dutch grammatical structures so that Dutch is the framework language but where they lack the correct word they just use a Polish one. When the girls are around their mother they still generally speak Polish to each other but Dutch will certainly take over here too as the language of intra-sibling communication. They still exclusively speak Polish to their mother and English to me so the core foundation of our One Parent One Language strategy has not been affected.
For me personally the only difference is that I listen to them speaking Dutch instead of Polish and interject when I want to say something. My wife's Dutch is also good enough that she understands anything they are saying to each other but their Polish grandmother (who is visiting right now) finds the use of Dutch more difficult. Whereas before she could follow everything they were discussing in Polish now she is excluded from the conversation. They are not doing this on purpose but over time they will appreciate how language can be used as a weapon.